code: def __call__(self, sigma: torch.Tensor) -> torch.Tensor:
      return torch.ones_like(sigma, device=sigma.device)
  
file_path: generative-models/sgm/modules/diffusionmodules/loss_weighting.py
imports: from abc import ABC, abstractmethod
  import torch
label_desc: Use image node_id 1 for calling the UnitWeighting obj's underlying member method code with example usage: obj.__call__(sigma) and returns: torch